houghlines_in_python_helpers.py

def draw_lines(img, houghLines, color=[0, 255, 0], thickness=2):
    for line in houghLines:
        for rho,theta in line:
            a = np.cos(theta)
            b = np.sin(theta)
            x0 = a*rho
            y0 = b*rho
            x1 = int(x0 + 1000*(-b))
            y1 = int(y0 + 1000*(a))
            x2 = int(x0 - 1000*(-b))
            y2 = int(y0 - 1000*(a))
 
            cv2.line(img,(x1,y1),(x2,y2),color,thickness)   
                
 
def weighted_img(img, initial_img, α=0.8, β=1., λ=0.):
    return cv2.addWeighted(initial_img, α, img, β, λ)